If the banner still appears after using the config none command, still login with the default username and password anyway. The banner can be stored in a different part of the memory so it displays before EXOS is fully loaded.

There is no mechanical process such as a switch to clear the config, which means console access is mandatory.

For the X430 switch, Boot Rom versions prior to 1.0.1.5 don't have the config none option. Update to at least 1.0.1.5 to be able to clear the configuration through the Boot Rom.